Successful treatment of solitary toxic thyroid nodules with relatively low-dose iodine-131, with low prevalence of hypothyroidism
Forty-five patients with solitary toxic thyroid adenomas received 131I (mean dose, 10.3 mCi) for treatment of hyperthyroidism and were followed for 4.9 +/- 3.2 years (range, 0.5 to 13.5). Seventy-seven percent were euthyroid by 2 months, 91% by 6 months, and 93% by 1 year. Only 3 patients did not respond to a single dose of 131I, but all responded to multiple doses. Late recurrent hyperthyroidism occurred in 3 patients at 4.5, 6, and 10 years after treatment with a single dose of 131I. No patient developed clinical hypothyroidism, and none had a low serum thyroxine level associated with an elevated serum thyrotrophin level. Three patients developed minimal elevations in serum thyrotrophin levels: 1, 4, and 7.5 years after 131I treatment, their thyrotrophin levels were 8.4, 6.2, and 9.6 microU/mL, respectively. All 3 had normal serum thyroxine levels and were clinically euthyroid. Mean serum thyroxine concentrations of all patients were unchanged between 1 and more than 9 years of follow-up. These data suggest that solitary toxic adenomas may be treated with relatively low doses of 131I (5 to 15 mCi), and that post-treatment hypothyroidism is very unusual.
- Research Organization:
- Department of Medicine, Massachusetts General Hospital, Boston
- OSTI ID:
- 6334474
- Journal Information:
- Ann. Intern. Med.; (United States), Journal Name: Ann. Intern. Med.; (United States) Vol. 101:4; ISSN AIMEA
- Country of Publication:
- United States
- Language:
- English
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ADENOMAS
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ODD-EVEN NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC IODINE COMPOUNDS
ORGANS
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PEPTIDE HORMONES
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RADIOLOGY
RADIOTHERAPY
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THYROID
THYROID HORMONES
THYROXINE